Observation of B -meson semileptonic decays to noncharmed final states

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.16· OSTI ID:7165953

Fulton, R; Hempstead, M; Jensen, T; Johnson, D R; Kagan, H; Kass, R; Morrow, F; Whitmore, J; Wilson, P; Chen, W; McIlwain, R L; Miller, D H; Ng, C R; Schaffner, S F; Shibata, E I; Yao, W; Sparks, K; Thorndike, E H; Wang, C; Brock, I C ; Ferguson, T; Alam, M S; Kim, I J; Li, W C; Lou, X C; Sun, C R; Wang, P; Zoeller, M I; Bortoletto, D; Goldberg, M; Horwitz, N; Jain, V; Mestayer, M D; Moneti, G C; Sharma, V; Shipsey, I P.J.; Skwarnicki, T; Thulasidas, M; Csorna, S E; Letson, T; Alexander, J; Artuso, M; Bebek, C; Berkelman, K; Cassel, D G; Cheu, E; Coffman, D M; Crawford, G; DeWire, J W; Drell, P S; Ehrlich, R; Galik, R S; Gittelman, B; Gray, S W; Halling, A M; Hartill, D L; Heltsley, B K; Kandaswamy, J; Katayama, N; Kreinick, D L; Lewis, J D; Mistry, N B; Mueller, J; Namjoshi, R; Nandi, S; Nordberg, E; O'Grady, C; Peterson, D; Pisharody, M; Riley, D; Sapper, M; Silverman, A; Stone, S; Worden, H; Worris, M; Sadoff,

We report the first evidence of charmless semileptonic decays of {ital B} mesons. In the momentum interval 2.4--2.6 GeV/{ital c} where the background from {ital b}{r arrow}{ital cl}{nu} is negligible, the average of the measured {ital b}{r arrow}{ital ue}{nu} and {ital b}{r arrow}{ital u}{mu}{nu} partial branching ratios is {Delta}{ital B}{sub {ital ub}}(2.4,2.6) =(1.8{plus minus}0.4{plus minus}0.3){times}10{sup {minus}4}. Inclusion of data from the interval 2.2--2.4 GeV/{ital c}, where the lepton yield is dominated by {ital b}{r arrow}{ital cl}{nu}, gives {Delta}{ital B}{sub {ital ub}}(2.2,2.6) =(3.3{plus minus}0.8{plus minus}0.8){times}10{sup {minus}4}. {vert bar}{ital V}{sub {ital ub}}/V{sub cb}{vert bar} depends on the theoretical model of {ital b}{r arrow}{ital ul}{nu} decay and is approximately 0.1.

• OSTI ID: 7165953
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:1; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
B MESONS
BOSONS
BOTTOMONIUM
BRANCHING RATIO
CHARM PARTICLES
CORNELL 10-GEV SYNCHROTRON
CYCLIC ACCELERATORS
DATA
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FIELD THEORIES
GEV RANGE
GEV RANGE 01-10
HADRONS
INFORMATION
KOBAYASHI-MASKAWA MATRIX
LEPTONS
MATRICES
MATRIX ELEMENTS
MESONS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE PRODUCTION
PSEUDOSCALAR MESONS
QUARKONIUM
SEMILEPTONIC DECAY
SYNCHROTRONS
UNIFIED-FIELD THEORIES
UPSILON-10860 MESONS
VECTOR MESONS
WEAK PARTICLE DECAY